Question: By whom is the designer of the Burj Khalifa  employed?
Paraphrase: By whom is the originator of the Burj Khalifa employed?
SPARQL (Wikidata):  select distinct ?obj where { wd:Q12495 wdt:P84 ?obj . ?obj wdt:P31 wd:Q4387609 } 
Answer: Skidmore Owings Merrill